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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44315b9d4f1e71717eeeac70b5c0369e4bcc3246a779a0332bfae69bf4b97ab7' 
  AND token = '/3MxpSy95v2nPbv3QIhEKo3fplZTIqVcDN1rqc2A8tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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