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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154c2d6e6bec47fb5c50a7c286fd0d6f7444844dcd9aad4e73670acbee10b5de' 
  AND token = 'U4WU2+gEY7C5J56D2QnTOADqhuqPV7QolrrqqDiyygI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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