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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89718881aae855c1bcfcec681089120db0a51713116161c5f4a9923c9d7d9a0' 
  AND token = 'E0KwRlBB7BjAPEHfqhdpJLTS2aGF1iIZrqBeNv0zTfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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