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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091794d1414dd553f7e0b676b1244aa25080396ff4c38f067cedd2dd063c1a37' 
  AND token = 'QVMAvBiWfKbRPIG8btyN0Co7VAHQRvItytArqe+mWxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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