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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c272a0ace47f4cba68b6e27dc9b38fb3612f2e350381b95a0864c964d5a13c' 
  AND token = '5TaqQox62dzP8wnSIJmCx1d3ozLNGZSIdH3TvHqwdjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}