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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe2997e811872772ad8b49da7fb0d1b48de45a8a36b1ebee42acef9605e711b' 
  AND token = 'pGtpblwntnSEWY66pUPTnRNvKsYRQ8BjQkdGGwFsQRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00144

JSON explain

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