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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faf9ce7e08ef286c048248142437b90cc05c5cf3334510716d16d539c653526' 
  AND token = '13FR5M2u6perFuxlMA1jsfTuq++yOzjei7jcNret2zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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