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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8fafe55a9593013e24ec44dbba9d30257be98a1917bbd943eada9a0b28dc3c' 
  AND token = 'PKG8QEp3GRJUNrGYk1lSH9a/BQImg8e55rFA/ey9/+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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