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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867e5e05d6b8559484cc65f352b4406d593ff47d5727ae2b397b0a587945306f' 
  AND token = '8Iq+BErQLRQSg/jDnFctOb5ABSDRTcnHQ1pOySlq+vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00130

JSON explain

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