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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f628090e6b1f23c48ff6033420ddf5f980b147dd6028f5887b7061ce69ee12f' 
  AND token = '+ZHMvY/50YxI1K0Y1Kf1ejpnObkA91+Ssf7r1WqdQQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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