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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb02f3f983b4e458604bba5771c41c4599338a07b817240a05ede8352ee492e1' 
  AND token = 'dlzIiU0Cc6FOB5zqPKkv4xM7juCnParhjJ0C1MwmDKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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