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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2e771e54f0134f881d8d1302580c7d5b73fd2c060858d3f27f91740d2edcae' 
  AND token = 'M1nI93MjJa4XLdb6mm5xT9evVvcBKL1h+gxfgF+t4/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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