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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0096d85c06b7e3ed724244234e577c93c2836b25e2cdcb3c70353b20bf091845' 
  AND token = '6pYP07A88COl/jKEM+rF3xtl0ggG9oojQCk7F4/kk7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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