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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91d6aa9860542f0e5bd29832185d6f7a1e595b15a42d7b217198eafb7a35b48' 
  AND token = 'tCpif/q+FnhDJeUIxqnPokK8f7Vjscn8T86Ludtp1IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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