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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb4ec0e220e80e4e2ed486533f013e0571ceb735e4478239b4f0f8ab426dd06' 
  AND token = '7vSKbchv26c1dDAyYuPpEAGu1SsnOOXUXeykFQn0xEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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