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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecfbc30cf150ecc6a78b2977bacf0c506a1447b3df8bb32c98effa2f1bc5d33' 
  AND token = 'GFl+HyrRlm/ir0KhfSrsZO6A/r3TYgig4IleZ5htGao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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