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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71615ffb7ef04bdce6caf8faaf41aa8f3b18dc92a05362da7f26bad9c2919c2' 
  AND token = 'WM2FGuUflEQcJwMTJD/wtTMR8wiW9rV2U0DysGMyBN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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