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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71df16958f796e008963cce35ce66983466f89d0b35b267ee410cce1cab76110' 
  AND token = 'w8okrpTuBytJIT1pA7P+RS5zvXR/KyNK0CD/L3+NKC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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