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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7512980536ed92fb526307e8b9d9c0dc8dfa432247ca17a200d259152eba41ab' 
  AND token = 'PHKMAl1Q7Dbe25F04Zf/hVoQxkhyN0wFsv3z0uqOd64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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