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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a478aebe6360bb0aee656f705c1e32b6754a1fafb173a26a2c4799298d6ffb' 
  AND token = '8zuY9N0tuwn2qVRmx1TMAfKTyPdaomp46VEefpFB2jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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