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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13a0833e7f929701f74d2d73f0989e5c768ba73cca39cff09d21df946d090fd' 
  AND token = 'L44N2RYRyYiSMK60K2FduleawuMYrI7J3aINNo2t3Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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