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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99155a2a5d89635222e5a5e5ad6a253ba0dfe085a9d0c840b26aae44215381a' 
  AND token = '3I5gC/MWI+jnG6XKdjGW0HnqW0qPGjAlqLXWYRkJzBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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