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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5432630b1483bbd675c6b350debf149cdca8baa889c8c2ef8e8edd8486b3cf47' 
  AND token = 'ZSY512aSY9gHet1jtQL/i+CbgPeEc0H29m2zgOQv1l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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