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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f1e7c712cab6a40dd0a1eb7fdd74a80b84547219c6911bbd802eeb493d5924' 
  AND token = 'zJSiFpT/d8vWeqGDXIeKPOdQPpHFLZfjcS6Jx7miG1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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