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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbc37444a58ebe95e4d3b88d2571faeac1c5b398ebe5991bd5859bdbb8b8a1e' 
  AND token = '7avfGrMhjOMUlc9b1kNMVj+RB+Sz5rt74de0GseTllI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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