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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b0b13c439f8efe9c0afd20a827abee1cf530f3c1faa55caa76ec716df70579' 
  AND token = '0ymmk1piNMQHoIH50+cCZfsWOGanhNzd2yX3Sv2M6Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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