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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2e0e79f6f998675612dbcb4833728d0b3b3b81efdfc4bf39236f059309fcde' 
  AND token = 'RVQP813FeUGHzW0csEAvlzyimrkO7Q8w9oU84xsx2+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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