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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ea79e52367105e463fc09657eca7e43453eb83153e54e0e4dd16ab9b10dc1c' 
  AND token = 's4Yf+ohai8hQ1mjhLy9DXQKLO19lwTLXAKjSnh6+n+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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