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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83a67604dedcacec8169d49ea491c0f21cf2aeb4ed6d25f5eb868bab5c52eb7' 
  AND token = 'cjNB83HKWXnSGtiwo6tBp3BeUgQhXwToiJkG0ss/Q88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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