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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb11cadf0535b831c2a30f9f12ee4eb69efaab86285d8af3f86ca234bdc2e78b' 
  AND token = 'j/LTauGg32D8EqOYcG/bdnU6c2qQ2CI6GH5dnoAyFFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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