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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccddf83ab0455ffcf4f7493e0cc199e87b2ec791b7a73a1f841d55bd3ac077a3' 
  AND token = 'RmNQqRGVkr09um/FbOpFSAcbda19XAJaGJQXXP07HNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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