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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70896416910ce2c7ab7f9fb6880a7b5891aed25cfb32aed72c9521b562747c1' 
  AND token = 'N+8U2qA8UoGat2D6SwJvPY6mhCfXrqiTmf5NPsDgo7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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