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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48769e41f2be638bcf51873078437ed88e964eda10e4cfa56774b33994f4e96' 
  AND token = 'isvMCm4AZrJTzaeyz2HAcIzaa/jrQuC45z9X/Nz3Uxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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