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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9323e51d4d85348947d3563da3d1cc399638502e31d9d0d429c432283ea8b40' 
  AND token = 'kCP/uZ3Cbh2MArOiJ5u8lum2IcCBN/wpxrVFGUfJOr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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