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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2a187e9cda0fb56f9d1b26b137863e492da3f9c6d65be76e326853f96b0bfc' 
  AND token = 'LY3c3fLBit0+0+TK37Aim/6tUuH3gViARX9C+ENle8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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