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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2da6be88814f57a2b1e02d9a143249b713184068120192f824c0ec80c99e57' 
  AND token = 'I82q8lHj8RrQvAVI9K51UQvhGh62N1Er/ClpIKZSlH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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