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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a0f416ddb0a75d2063864a0034a1d1c3b944734aba5260a66b1ed3b9cb5c52' 
  AND token = '5TV8V7gLqKCdIQ9av71iMroRViAV5UW+oeRsSduAcF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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