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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aaa67571dfe9eff3142ef9ac7b793d8c944bc2e70a968fb2e959751aeff38b6' 
  AND token = 'T5ZscUT1xlZUMgrtJTAXB5jlhbp+d2ETKi4JPDn7XRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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