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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b4ccb174bcdbea6418e8980506efb1df6750b900726093eb6df39e1a207029' 
  AND token = 'T3W1mTL+vQgkL3x/AW8Q6xmEuuPlOWu13effguND95w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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