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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553e24683598780e66f0a0ce3cd8381a958b518c4a6af9fb16cb929fe77f5501' 
  AND token = 'tbXr0SAPLqWgnPXkSgJBN3zh6pkCh4jj9QC4P3yhm0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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