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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c5c55747b4c34b67f41e123a8962917fbd6f3b393b8845ded8a8526960ef39' 
  AND token = 'fByFksoukKmuovLPoyB69MDBit1+o0jXDGsTypmlSuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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