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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc8c64a83f5c61c74effa7ca9c657c1314d297bb1294d4557d08560410ba8f9' 
  AND token = '4p/+bc+j0uklWNL9jPwuF26OG9IFyGuGwI5bFTZ1UiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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