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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d44c853da05da10665cea94f1ec32cb539e7283decbc0354ab742c49fd0ba3' 
  AND token = 'pKsoE9fZrpEAV2bJ+gGD/rsbnnnW8/NFekk1p5HQmjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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