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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b71d865545cc75094276d14aa45ded6c7b6cf706f814cb287ee6f2f21c642fc' 
  AND token = 'fW65YsJlxiyw/3Xjtr4Q7bC99dK34nkwFEMwClXQtbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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