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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa4c72cfa4261138c58f02a215855d3d02a80e669f3727a9250a7a124a576ba' 
  AND token = 'PLX6oj3jYQJOpnk/+dzejhelagToEH55Nt2PnBPWNdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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