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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520541909038f723c411c5c7d31da51d5c8c44486b563539f5e35e6971c99818' 
  AND token = 'aJ+6tQEJ71tYgg7X6+aREWOcDIdC8yajFDaCp2WWUzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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