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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dda1582e87728b7827188742d64038e527f5d0503de46322e524b557515fc0' 
  AND token = '1kHN1InQyPYTeeJcm+0Cz3mjLn9FjEXyYOT9kHgtS9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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