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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad1adf8ccdae6f42aa5e9ac433b4fbc3a7cb75fa6bec57f565a436c8a265d01' 
  AND token = 'XJYziUCSQT2N6Uy6OMOqLQlzSYWLndYW2gIVs4GELXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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