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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338c1c7a19bd9b3a0b04101a1c4b04dd4aa87cc75b124dc647a4e3af5334eded' 
  AND token = 'ui8HZps0qLSVM5i2oMdjQtqgnQRI45jGr7fR2cn39u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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